Malicious PDF — malware analysis report

Static analysis result for SHA-256 85fc81e64db2357a…

MALICIOUS

PDF

69.3 KB Created: 2020-08-23 05:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1ead6dd5c1d7cb5d99625648bdb1a47 SHA-1: cf24b5c8649ea3693bc5dce8b958741a5f02c634 SHA-256: 85fc81e64db2357ae3519465540ff4dff4529172fe3f3ec3ae360f3179ba6562
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though obfuscated, contains text related to medical guidelines and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=microscopic+haematuria+guidelines+racgp
    • http://files.conteanalytics.com/uploads/1/3/2/6/132695832/pasuva_mevir_xejekev_wogiboxin.pdf
    • http://files.holytrinityholmfirth.org.uk/uploads/1/3/0/8/130874599/7897996.pdf
    • http://zavatali.gappraisals.com/uploads/1/3/0/8/130874493/fetalosuven.pdf
    • http://files.southamptonteachers.com/uploads/1/3/0/9/130969565/2b54e02ed53.pdf
    • http://files.aj-flower.com/uploads/1/3/0/8/130814706/5e77625ca6e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4066/0895/files/27371361543.pdf
    • https://cdn.shopify.com/s/files/1/0431/5175/3365/files/urbanization_group_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/0715/6128/files/nazomudomun.pdf
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/xadetubikudokogukukizu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4229/0336/files/troy_bilt_pressure_washer_2800_psi_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/4248/8998/files/16011110761.pdf
    • https://cdn.shopify.com/s/files/1/0429/9204/2137/files/mubusog.pdf
    • https://cdn.shopify.com/s/files/1/0434/0216/6428/files/stevie_ray_vaughan_died.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zututekafufefosapebuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/5656/9249/files/nokizux.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd3.bin
883a1c1ef0cfbec8d4dfe11da2ad2518da348bafc0be1fe811818ed5b684d770		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD3 5492 bytes
font_01_sfnt_off0000e25d.bin
73aa0bd5bc57de7df4f22dae02b43729b18633a2c5a05187507eb98904323524		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE25D 11028 bytes

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